mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Maxim/TARGET_MAX32620C/analogin_api.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
mbed-dev library. Release version 162

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /*******************************************************************************
Anna Bridge 186:707f6e361f3e 2 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
Anna Bridge 186:707f6e361f3e 3 *
Anna Bridge 186:707f6e361f3e 4 * Permission is hereby granted, free of charge, to any person obtaining a
Anna Bridge 186:707f6e361f3e 5 * copy of this software and associated documentation files (the "Software"),
Anna Bridge 186:707f6e361f3e 6 * to deal in the Software without restriction, including without limitation
Anna Bridge 186:707f6e361f3e 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
Anna Bridge 186:707f6e361f3e 8 * and/or sell copies of the Software, and to permit persons to whom the
Anna Bridge 186:707f6e361f3e 9 * Software is furnished to do so, subject to the following conditions:
Anna Bridge 186:707f6e361f3e 10 *
Anna Bridge 186:707f6e361f3e 11 * The above copyright notice and this permission notice shall be included
Anna Bridge 186:707f6e361f3e 12 * in all copies or substantial portions of the Software.
Anna Bridge 186:707f6e361f3e 13 *
Anna Bridge 186:707f6e361f3e 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
Anna Bridge 186:707f6e361f3e 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Anna Bridge 186:707f6e361f3e 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Anna Bridge 186:707f6e361f3e 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
Anna Bridge 186:707f6e361f3e 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
Anna Bridge 186:707f6e361f3e 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
Anna Bridge 186:707f6e361f3e 20 * OTHER DEALINGS IN THE SOFTWARE.
Anna Bridge 186:707f6e361f3e 21 *
Anna Bridge 186:707f6e361f3e 22 * Except as contained in this notice, the name of Maxim Integrated
Anna Bridge 186:707f6e361f3e 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
Anna Bridge 186:707f6e361f3e 24 * Products, Inc. Branding Policy.
Anna Bridge 186:707f6e361f3e 25 *
Anna Bridge 186:707f6e361f3e 26 * The mere transfer of this software does not imply any licenses
Anna Bridge 186:707f6e361f3e 27 * of trade secrets, proprietary technology, copyrights, patents,
Anna Bridge 186:707f6e361f3e 28 * trademarks, maskwork rights, or any other form of intellectual
Anna Bridge 186:707f6e361f3e 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
Anna Bridge 186:707f6e361f3e 30 * ownership rights.
Anna Bridge 186:707f6e361f3e 31 *******************************************************************************
Anna Bridge 186:707f6e361f3e 32 */
Anna Bridge 186:707f6e361f3e 33 #include "mbed_assert.h"
Anna Bridge 186:707f6e361f3e 34 #include "analogin_api.h"
Anna Bridge 186:707f6e361f3e 35 #include "adc.h"
Anna Bridge 186:707f6e361f3e 36 #include "pinmap.h"
Anna Bridge 186:707f6e361f3e 37 #include "PeripheralPins.h"
Anna Bridge 186:707f6e361f3e 38
Anna Bridge 186:707f6e361f3e 39 #define ADC_FULL_SCALE 0x3FFU
Anna Bridge 186:707f6e361f3e 40 #define INT_FULL_SCALE 0xFFFFU
Anna Bridge 186:707f6e361f3e 41 #define FLOAT_FULL_SCALE 0.6f
Anna Bridge 186:707f6e361f3e 42
Anna Bridge 186:707f6e361f3e 43 static int initialized = 0;
Anna Bridge 186:707f6e361f3e 44
Anna Bridge 186:707f6e361f3e 45 //******************************************************************************
Anna Bridge 186:707f6e361f3e 46 void analogin_init(analogin_t *obj, PinName pin)
Anna Bridge 186:707f6e361f3e 47 {
Anna Bridge 186:707f6e361f3e 48 // Make sure pin is an analog pin we can use for ADC
Anna Bridge 186:707f6e361f3e 49 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
Anna Bridge 186:707f6e361f3e 50
Anna Bridge 186:707f6e361f3e 51 // Set the object pointer and channel encoding
Anna Bridge 186:707f6e361f3e 52 obj->adc = MXC_ADC;
Anna Bridge 186:707f6e361f3e 53 obj->channel = (mxc_adc_chsel_t)pinmap_find_function(pin, PinMap_ADC);
Anna Bridge 186:707f6e361f3e 54
Anna Bridge 186:707f6e361f3e 55 if (!initialized) {
Anna Bridge 186:707f6e361f3e 56 MBED_ASSERT(ADC_Init() == E_NO_ERROR);
Anna Bridge 186:707f6e361f3e 57 initialized = 1;
Anna Bridge 186:707f6e361f3e 58 }
Anna Bridge 186:707f6e361f3e 59 }
Anna Bridge 186:707f6e361f3e 60
Anna Bridge 186:707f6e361f3e 61 //******************************************************************************
Anna Bridge 186:707f6e361f3e 62 float analogin_read(analogin_t *obj)
Anna Bridge 186:707f6e361f3e 63 {
Anna Bridge 186:707f6e361f3e 64 uint16_t tmp;
Anna Bridge 186:707f6e361f3e 65 float result;
Anna Bridge 186:707f6e361f3e 66
Anna Bridge 186:707f6e361f3e 67 // Start conversion with input scaling and no input buffer bypass
Anna Bridge 186:707f6e361f3e 68 ADC_StartConvert(obj->channel, 1, 0);
Anna Bridge 186:707f6e361f3e 69
Anna Bridge 186:707f6e361f3e 70 if (ADC_GetData(&tmp) == E_OVERFLOW) {
Anna Bridge 186:707f6e361f3e 71 result = FLOAT_FULL_SCALE;
Anna Bridge 186:707f6e361f3e 72 } else {
Anna Bridge 186:707f6e361f3e 73 result = (float)tmp * (FLOAT_FULL_SCALE / (float)ADC_FULL_SCALE);
Anna Bridge 186:707f6e361f3e 74 }
Anna Bridge 186:707f6e361f3e 75
Anna Bridge 186:707f6e361f3e 76 return result;
Anna Bridge 186:707f6e361f3e 77 }
Anna Bridge 186:707f6e361f3e 78
Anna Bridge 186:707f6e361f3e 79 //******************************************************************************
Anna Bridge 186:707f6e361f3e 80 uint16_t analogin_read_u16(analogin_t *obj)
Anna Bridge 186:707f6e361f3e 81 {
Anna Bridge 186:707f6e361f3e 82 uint16_t tmp;
Anna Bridge 186:707f6e361f3e 83 uint16_t result;
Anna Bridge 186:707f6e361f3e 84
Anna Bridge 186:707f6e361f3e 85 // Start conversion with input scaling and no input buffer bypass
Anna Bridge 186:707f6e361f3e 86 ADC_StartConvert(obj->channel, 1, 0);
Anna Bridge 186:707f6e361f3e 87
Anna Bridge 186:707f6e361f3e 88 if (ADC_GetData(&tmp) == E_OVERFLOW) {
Anna Bridge 186:707f6e361f3e 89 result = INT_FULL_SCALE;
Anna Bridge 186:707f6e361f3e 90 } else {
Anna Bridge 186:707f6e361f3e 91 result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F);
Anna Bridge 186:707f6e361f3e 92 }
Anna Bridge 186:707f6e361f3e 93
Anna Bridge 186:707f6e361f3e 94 return result;
Anna Bridge 186:707f6e361f3e 95 }